Rotary work holding machine



12, 1941- G. A. CARLSON 2,252,594

ROTARY WORK HOLDING MACHINE Original Filed June 30, 1938 4 Sheets-Sheetl INVENTOR. Gus/are I3 (bl/50x? BY a.

ATTORNEY.

Aug. 12, 1941.

G. A. CARLSON ROTARY WORK HOLDING MACHINE 4 Sheets-Sheet 2 OriginalFiled June 30, 1938 INVENTOR, Gas/aye 7. .Zorbof? A 'TTORNEY.

Aug. 12, 1941. G. A. CARLSON ROTARY WORK HOLDING MACHINE Original FiledJune 30, 1938 4 Sheets-Sheet 3 IINVENTOR. 6275/0 V6 6 Cor/5w? ATTORNEY.

'Aug. 12, 1941. cA so 2,252,594

ROTARY WORK HOLDING MACHINE Original Filed June 30, 1938 4 Sheets-Sheet4 f3 Q I INVENTOR.

BY- f ATTORNEY.

Patented Aug. 12, 1941 "UNITED STATES PA ENT OFFICE 216 698, June 30,1938. Thisapplic'ation May 1, 1940, Serial No. 332,817

:7 Claims.

"This application is a rte-filing of, application Serial No. 216,698,filed June 30, 1938, which became abandoned for failure to respond to anoflice action Within six months, invention relates to, apparatus forgrinding and polishing metal objects and has for its primaryobject toprovide a machine for removing weld flashes from trim articles such asfor. exarr'iplaithe garnish moldings which ordinarily decorate windowopenings of automobiles. v V

vAnother object is to provide a .machine .embodying a plurality of workperforming members arranged in a series ranging from rough grinding tofinish grinding, a plurality of work holders and a table revolvableabout a Vertical axis carrying said work holders and. adapted, byrevolving, to present work pieceson the holders to the several Workperforming members, Sue cessively. The Work holders are loaded at agiven point, the loading station, and by the completion of onerevolution of the table, are presented to the several work performingmembers and are returned to the same point. As a result of move.- mentof the work holders through aj oircular path they may be loaded andunloaded at a single station and work performing members may be groupedas closely as desired along the entire path of movement of the .workholders.

Another object is to provide meansfor revolving the table periodicallyand for automatically stopping and locking the table with the workholders located in an operative relationship with Work performingmembers,. said locking means being automatically rendered inoperativeatthe' expiration of a period of time sufilcient to permit each workperforming member to complete its particular stage of the work function.V

It is, therefore, an object to provide a machine which willprogressively present work to suecessive work performing means atsuccessive stations whereby a plurality of consecutive operations maybeperformed thereon, to progress of the work being interrupted at eachstation to per: mit a cyclic movement of the work in presenting large ornon-planar surfaces to the work performing means, and thereaftercontinued to the next station. v. v,

Another object is to provide means for automatically removing the workperforming members from the path of movement of the work pieces whilethe table is in motion, and forauto matically placing the workperforming members in contact with the Work pieces when the tablefdrriririg' members throughout their entire width. Another object is toprovide means yieldingly supporting the work performing membersWherethey are capable of following the contour of work pieces duringpivoting thereof, and means for maintaining a substantially constantpressure between the work performing members and the workpieces duringsuch pivoting.

Another objeot is to provide a machine for 1() handling frame-like workpieces embodying pivoted work holders adapted to hold thework pieces ina horizontal position during movement of the tableto therebyenablepositioning of the workf performing members above the path ofmovemfint of thework pieces; When the work pieces are positioned.opposite the work performing members the latter are lowered into (2ntact therewith, and the work pieces are pivo d to an erect position andthen back to the horiz ontal thus enabling the work performing memberstocontact the entire width thereof.

. .In'ihe aeco a n n Fig. 1 is a plan' View of the machine with some ofthe uppermost parts removed to expose the mechanism itherebeheath;

Fig. 2 is a fragmental vertical section illustrating one of the workperforming members in elevation; i H A I Fig. 3a is an elevation of adetail;

f Fig. 3 is an 'elevation of the work performing memberof Fig. 2illustrating another position t e e t Figs 4 and 5 are sections taken onlines L- i and ;5-f5, respectively, of Fig. 2;

Fig, 6 isa section takenon the line 6 6 of Fi H n. Fig. 7 afra'gmentalvertical section of the machine, illustrating another workperforming member r gr'igs. 8 and ,9 are sections taken respectively onthjelines .88 and 9-59 of Fig. 7;

Fig. 10 is a section taken on the line i|fllll of Fig. 9; Y

11 is a horizontal section taken on the plane indicated by theline'l |lI. of Fig. 2

7 Fig-l2 is a section taken on the line l2-l2. of Fig.1l

,{Fig- 13 is: an elevation of a work holder, and

V Fig. 14 aseotion taken on rthe'line M-M of ery by rollers 4. Attachedto the table 3 is a disct having a plurality ofradially extending wantdpted o ec i a p n 1 o a r t ab element}; whereby the table 3 is rotateda fracion o r o ut nwi hz ach revolution of 69,; element 8. The discli,litsways 6; th pin l a d I3 and has a spring l4 urging movement thereofin a direction to engage the lugs rotatable element 8 is a cam I5 whichengages an adjustably extensible plunger I6 with each revolution of theelement 8 to move the latch |2 from engagement with the lugs H as thepin 1 moves into operative relationship with one set of ways 6.

Accordingly, the table 3 is intermittently moved a predeterminedfraction of a revolution, and is positively locked against movement whenits intermittent moving means is inoperative.

A plurality of work receiving fixtures are mounted on the table 3 spacedabout the periphery thereof distances equal to the distance a point onthe periphery travels with. each intermittent movement. Each fixturecomprises a pair of brackets |6 rotatably supporting a work'holder |1having 'two substantially U-shaped arms |1a into which a frame-like workelement l8 may be manually inserted. As may be seen in Fig. 2, each worksupport H has a gear sector connected thereto and meshing with a gear 2|which in turn meshes with a gear 22. A slidable rack 23 meshes with thegear 22 and is adapted to be moved in one direction by a cam 24 and inthe other direction by a cam 25. The several cams 24 and 25 are mountedon shafts 26 having sprockets 21 thereon, and the several sprockets 21are connected by a chain 28 which is driven by a sprocket 29 on theabove described driven shaft ID.

As the table 3 comes to rest and is locked against movement, each cam 24has one of the racks 23 positioned opposite the same, and as the cams 24and 25 are all rotated in unison, the racks 23 are reciprocated andcause the work support I1 to pivot through at least one hundred andeighty degrees. The normal position of the work holder is substantiallyhorizontal and, as shown in Fig. 1, a spring pressed plunger 36 isconnected to each work holder by a chain 3| to bias movement toward thehorizontal. An adjustable set screw 32 acts upon a radial arm 33 topositively restrict pivotal movement of the work holder and to therebyrelieve the cams 24 and 25 of friction.

Mounted on the stationary post 2 are a plurality of brackets 34supporting work performing units such as that shown in Figs. 2 to 6, andeach of which comprises a base 35 having a bracket 36 supporting atrunnion shaft 31. A shaft 38, extending through the trunnion shaft 31,has a pulley 38a on one end operated by a belt 39, pulley 40 and motor4|. The motor 4| is carried by a bracket 42 on the vertical post 2. Onthe other end of the shaft 31 is a pulley 43 over which an endlessgrinding band 44 is trained, the other end of the band 44 being trainedover two pulleys 45 and 46. The pulley 45 is supported at the free endof an arm 41 which is pivotally connected to a radially extending arm 48journalled on the trunnion shaft 31. Intermediate its ends the arm 41 ispivotally connected at 49 to a lever 50 which is pivoted at 5| on thebracket 35.

On the The roller 46 is supported by an arm 52 which is pivoted at 53 ona stationary bracket 54, and a spring 55 acts upon the arm 52 to biaspivotal movement thereof in a direction, pushing it against the band 44.The spring 55 may be adjusted to vary the pressure exerted by the arm 52.and roller 46 on the band 44, and the roller 46 presses against theband at a point directly opposite where the band contacts the workpiece.

Mounted on a stationary bracket 56 is a lever 51 having a roller 58thereon which rides on top of an annular cam 59 carried by the rotatabletable 3. On its other end the lever 51 has an adjustable set screw 60which engages a projection 6| on the arm 52. The cam 59 has a pluralityof notches 62 spaced apart a distance equal to the distance a point onthe cam travels with each fraction of a revolution of the table 3, and athe roller 58 rides the cam 59 the lever 51 is rocked to a positionwhere it pivots the arm 52 to the elevated position shown in Fig. 3, andas the roller falls into one of the notches 62, as it does each time thetable 3 comes to rest, the arm 52 falls to V the position shown in Fig.2.

, spring 63 is supported by a rod 64 and acts upon bracket 66 carrying arotatable spindle 61.

a radial arm 65 connected to the arm 48 whereby the latter pivots andshifts the arm 41 in a direction tightening the band 44.

Infthe position shown in Fig. 2 it may be assumed that the table 3 hasjust come to rest, the roller 46 has been lowered, and immediatelyfollowing this stage the cams 24 and 25 reciprocate the racks 23 andpivot the fixtures l1 whereby the work pieces carried thereby contactthe bands 44. In other words, the fixtures l1 will pivot to asubstantially erect position and then back to the horizontal positionprior to the next movement of the table.

7 In Figs. 7, 8, 9 and 10, there is shown a disc type grinding orfinishing unit comprising a An elongated arm 68 is provided with alengthwise extending slot 69 through which a bolt 18 extends and securesthe arm to the spindle 61. Rods 1| are ivotally connected to the support12 of the bracket 66 and have springs 13 thereon joined together at 15,whereby the outer end thereof may be angularly disposed. On the outerend of the arm 68 is a disc grinder 16 having an operating pulley 11.The pulley 11 is driven through a belt 18 by an electric motor 19carried "by a plate 86 attached to the arm 68 directly over the spindle61. Connected to the arm 68 is a lever 8|, adapted to be adjusted by aset screw 82, and having a roller 83 riding upon the cam 59.

As shown in Fig. 7, the arm 68 is lowered so that as the work holder |1adjacent thereto is pivoted the work carried by the fixture contacts thedisc 16. In this position, the roller 83 is in one of the notches 62,and as the table 3 again moves the roller is elevated and results inelevation of the arm 68.

From the foregoing it becomes apparent that as thework holders l1 cometo rest opposite the cams 24 and 25 they are pivoted to an erectposition and back to the horizontal. During this pivotal movement thework pieces are worked upon and in the case of garnish moldings theflash resulting from welding the same may be ground away and the surfacefinished and smoothed. The band grinders are the rough grinders, and inorder that they will not mar surfaces adjacent the flash the rollers 56are crowned as shOWn in Fig. 30.. With a plurality of work performingunits, as here disclosed, each may perform one stage in the finishingprocess, and as the work pieces travel once around the table they may becompletely finished.

It is more convenient to load and unload the work holders while they arevertical, and for this purpose a cam 84 is mounted on the stationarytable whereby the racks 23 contact the same as the table rotates. Thecam 84 forces the racks outwardly and pivots the work holders to avertical position, in which position they remain for a substantialfraction of rotation of the table 3.

What is claimed is:

1. In apparatus of the character described, a revolvable table, aplurality of work holders on said table, a plurality of work performingmembers arranged about the table, means for revolving said tableintermittently and for stopping the table with work holders positionedopposite work performing members, means for moving the work performingmembers into contact with work pieces carried by the holders, means formoving work holders adjacent work performing members through a completecycle of reverse movements, and means for moving and holding theremaining work holders at the mid-point in their cycle of reversemovements.

2. In apparatus of the character described, a revolvable table, aplurality of work holders on said table, a plurality of work performingmembers arranged about the table, means for revolving said tableintermittently and for stopping the table with work holders positionedopposite work performing members, means for moving the work performingmembers into contact with work pieces carried by the holders, means forpivoting the work holders adjacent work performing members through acomplete cycle of reverse movements, and means for holding the remainingwork holders at the mid-point of their cyclic movements.

3. In apparatus of the character described, a revolvable table, aplurality of work holders on said table, a plurality of tiltable workperforming members arranged about the table, means for revolving saidtable intermittently and for stopping the table with work holderspositioned opposite work performing members, means for moving the workperforming members into contact with work pieces carried by the holders,and means for moving other work holders to an erect position and forholding said other work holders in an erect position for reception orremoval of work pieces.

4. In apparatus of the character described, in sub-combination, a rotarytable, means for intermittently moving said table, means for stoppingsaid table at predetermined points in its rotation and for predeterminedperiods of time, work holders carried by said table, reciprocating meansfor pivoting said work holders in one direction, spring means forpivoting said work holders in the other direction, cams located andtimed with respect to the movement of said table whereby they move saidreciprocating member against the opposition of the spring means whensaid table is stationary, and a cam adapted to pivot the work holders inthe first direction during a predetermined stage in the travel of saidtable and to hold said work holders against movement in the seconddirection during said travel stage.

5. In apparatus of the character described, a work holder for receivingframe-like work pieces, means for moving said work holder in a definitepath between a loading station and an unloading station, a plurality ofwork performing members positioned adjacent the path of movement of thework holder, means for periodically moving the work holder to positionit adjacent each performing member successively, means operative duringmovement of the work holder for holding the work holder in a positionwith the frame-like work pieces horizontally disposed, means operativeduring each period of rest for actuating the work holders positionedadjacent the work performing members to swing the work pieces from theiroriginal position to an erect position and then back to their originalposition before resumption of travel to the next succeeding workperforming member, and means for moving the work performing members intocontact with the work piece on the holder during swinging movement ofthe work piece.

6. In apparatus of the character described, a revolvable table, aplurality of work holders carried by said table and adapted to receiveframelike work pieces, a work performing member positioned adjacent thetable, means for intermittently revolving said table and for stoppingsaid table as each work holder is positioned opposite the workperforming member, means operative during movement of the table forholding the work holder in a position with the work pieces carriedthereby in a substantially horizontal position, means for moving thework performing member contact with a work piece on each holder as it ispositioned adjacent thereto, and means operative during each period ofrest of the table for actuating the work holder adjacent the workperforming member to swing the work piece from its original position toa substantially erect position and back to its original position beforeresumption of movement of the table.

7. In apparatus of the character described, a revolvable table, aplurality of work holders carried by said table and adapted to receiveframelike work pieces, work performing members positioned above saidtable, means for intermittently revolving said table and stopping saidtable with work holders positioned adjacent work performing members,means operative during movement of the table holding the work holderswith the work pieces substantially horizontally disposed for clearancebeneath the work performing member, means operative during each periodof rest for actuating the work holders to swing the work pieces fromtheir original position to a substantially erect position for contact ofinner surfaces of the work pieces with work performing members and thenback to their original position before resumption of movement of thetable, and means for lowering the work performing members for contactwith work pieces carried by Work holders positioned adjacent thereto.

GUSTAVE A. CARLSON.

